't even on the witness list, gabrielle giffords. if you take a look at the screen, you can see a handwritten note written by her speech therapist, i am told, the 16 sentences she uttered before this committee and had everybody in the room, no matter what their position on guns, mesmerized. a dramatic entrance from a woman who was a congressional colleague until a gunman shot a bullet through her head while she was doing her job. even more dramatic, gabby giffords labored yet passion nal plea for passion. >> speaking is difficult but i need to say something important. violence is a big problem. too many children are dying. too many children. we must do something. be bold, be courageous, americans are counting on you. >> reporter: giffords is an advocate and so is her husband mark kelly. >> a strong supporter of the second amendment as anyone on this panel. my wife would not be sitting in this seat, she would not have been sitting here today if we had stronger background checks. >> reporter: at the other end of the table, the other star witness with a very different perspective.